The pair came together to perform David Guetta and Sia's 2011 hit 'Titanium' to mark Veterans Day.
Rihanna, Eminem, Bruce Springsteen, Carrie Underwood, Dave Grohl and Metallica also performed at the concert on the National Mall.
HBO teamed up with Tom Hanks to put on the concert, which featured presenters Steven Spielberg, Meryl Streep, John Oliver, Jack Black, Bryan Cranston and George Lopez.
Earlier this week, Rodney Jerkins revealed that Jessie J and Ariana Grande will record an updated version of 'The Boy Is Mine'.source